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This is related to #667 and similiar issues

Pretty print 'extensions' and 'tested-with' fields in one line.

'install --enable-tests' shouldn't actually run tests.

Add a 'haddock' section to '~/.cabal/config'.

Conflicts:
	Cabal/Distribution/ParseUtils.hs

Fix #893 (Broken links in user guide)

Fix #1569.

A new pretty-print has been introduced `D.ParseUtils.commaNewLineListField`.
It is similar to `D.ParseUtils.commaListField` but has each item on its own
line.

The constraints section of the package environment is pretty printed with
`commaNewLineListField`.

* Change `guessPackageName` to translate arbitrary strings into valid
package names.
* Change type of `packageName` flag from String to PackageName and
reject names that do not pass PackageName's corresponding parse
function.

Add missing Cabal init licenses

to have been inaccessible.

Add a warning for sections that are not on the top level.

'ChoiceOpt' is really an enum, when we were using it is a boolean the default
value wasn't printed correctly in the config file.

Before:

-- hscolour:

After:

-- hscolour: False

Otherwise this field is by default printed as 'all: False' instead of '-- all:'
in the config file. Ideally, we'd like to print the commented default value.

Fixes #931, #1585.

The new config file section looks like this by default:

    haddock
      -- keep-temp-files: False
      -- hoogle: False
      -- html: False
      -- html-location:
      -- executables: False
      -- tests: False
      -- benchmarks: False
      -- all:
      -- internal: False
      -- css:
      -- hyperlink-source: False
      -- hscolour-css:
      -- contents-location:

Add a new flag '--run-tests' for running tests. Fixes #1647.

Output the prologue file in UTF-8 when Haddock >= 2.15.

Fixes #1721.

Implement '--show-details=streaming' to show test logs in real-time

This is a workaround to enable streaming test logs in Cabal's test
suites.

LibV09 tests are still non-streaming because those tests do not use
stdout anyway.

The test runners for exitcode-stdio and detailed tests will be separated
into their own modules. They cannot share a test runner because
'--show-details=streaming' does not make sense for detailed tests the
way they are implemented now. The detailed test runner needs to be
substantially rewritten anyway, so splitting up the test runners will
eventually accomodate that goal.

According to @haasn on IRC, '--source-entity-line' will be supported by Haddock
2.14.